Colorimetric ‘naked eye’ sensor for fluoride ion based on isatin hydrazones via hydrogen bond formation: Design, synthesis and characterization ascertained by Nuclear Magnetic Resonance, Ultraviolet–Visible, Computational and Electrochemical studies

Polar and nonpolar iron (II) complexes of isatin hydrazone derivatives as effective catalysts in oxidation reactions and their antimicrobial and anticancer activities

“…Two or three drops of L-ascorbic acid was added to the reacting mixture preventing the oxidation of Fe 2+ ion to Fe 3+ ion, as reported previously. [3,4,8] The mixed solution was heated at 70 C for 3 h. The solvent was removed and the residual was washed several times with Et 2 O and recrystallized in methanol for Fe (LDBu) 2 and in MeOH-H 2 O (1:1) mixture for Fe (LSO 3 Na) 2 . Both complexes were dried in an oven for overnight to give 0.58 and 0.54 g with 72% and 69% of Fe (LDBu) 2 and Fe (LSO 3 Na) 2 , respectively.…”

“…[3] As naked eye sensor for fluoride ions, new derivatives of isatin hydrazones were synthesized by Gauthama et al recently. [4] Furthermore, new isatin hydrazone based as fluorescent chemosensor was prepared to examine its behavior toward iron (III) ion, which published by Gao et al [5] Due to the powerful coordinated ability as backbone pincer chelating ligands to transition metals in metalorganic compounds, development of new metalated isatin hydrazones derivatives is an attractive point in research with progressed applicable features for the inorganic chemists, especially in various catalytic and biological purposes. [6,7] The alternative uncertain geometrical structure of isatin hydrazones toward metal ion interpreted the less published works of their corresponded complexes.…”

Anion Recognition Employing ‐NH Linked Organic Moieties

“…Limit of detection of fluoride ions was 0.45 ppm in 100 % CH 3 CN and 0.41 ppm in 20 % aqua CH 3 CN. [54]…”

Ultrasensitive colorimetric detection of fluoride and arsenate in water and mammalian cells using recyclable metal oxacalixarene probe: a lateral flow assay

“…The development of ultrasensitive assays based on colorimetric and fluorescence probes has got immense attention during the last couple of decades due to their large optical field enhancement properties that result in the strong scattering and absorption of light 12 , 13 . Additionally, the field of biochemical sensors has witnessed an explosion because of its unique optical as well as fluorometric properties 14 , 15 .…”